404 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



shaped, longer than wide, 0.144 to 0.165 in width. Acetabulum about 

 Yz body length from anterior end (at moderate body extension), 0.085 to 

 0.097 in diameter or a little over half the diameter of oral sucker. Genital 

 pore median, posterior to intestinal bifurcation, varj'ing from about mid- 

 way between suckers to considerably nearer acetabulum. Prepharynx 

 short; pharynx usually displaced to lie beside posterior portion of oral 

 sucker, about twice as long as wide (0.068 by 0.032 in the type speci- 

 men) ; fairly short esophagus; ceca not reaching posterior end of body and 

 apparently ending in region of testis. Testis approximately in midbody, 

 not far posterior to acetabulum, ovoid ; cirrus sac large, curved claviform 

 in shape, extending diagonally backward and to the left, 0.262 to 0.285 

 long, 0.087 to 0.116 wide; large ovoid seminal vesicle in basal third of 

 cirrus sac ; middle third of sac containing a pars prostatica with large, tall, 

 thin-walled cells and prostatic cells; distal third of sac containing a 

 spined cirrus. Ovary to the right, immediately postacetabular and pre- 

 testicular, overlapping both testis and acetabulum, ovoid, smooth, longer 

 than wide. Vitellaria consisting of 8 or 9 follicles in each of 2 widely 

 separated lateral groups at the acetabular and ovarian level, the right 

 group overlapping the ovary dorsally. Uterus filling almost the entire 

 hindbody, partly overlapping testis; sperm cells present in early coils of 

 uterus. Metraterm sac 0.202 to 0.262 long by 0.076 to 0.082 greatest 

 width (almost as large as cirrus sac), extending along left side of and 

 parallel to cirrus sac, containing a large metraterm vesicle (filling its 

 basal half) and a spined metraterm. Uterus entering metraterm sac later- 

 ally just anterior to vesicle. Eggs elongate, 25 to 28 by 8 to 9 ix. Excre- 

 tory vesicle not clearly seen, but in one specimen it seemed to be a very 

 short sac. 



Comparisons. Proctotrema costaricae differs from all previously 

 named species, except P. bacilliovatum Odhner, 1911, in its long narrow 

 eggs. It differs from P. bacilliovaUan in shape of ovary and testis, in de- 

 velopment of the thin-walled prostatic vesicle cells, structure of the met- 

 raterm sac, and in that the egg length is about 3 times the egg width 

 instead of 4 times as in P. bacilliovatum. In both species the eggs are 8 to 

 9 ju, in width, but in P. bacilliovatum they are 31 to 33 /a instead of 25 to 

 28 ju,. 



Paramonorcheides bivitellosus, new species 

 (Plate44, fig. 91) 



Host: Symphurus atramentatus Jordan and Bollman 



Location: Intestine 



